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Date: Wed, 23 Aug 2023 21:14:10 +0530
From: Nitin Rawat <quic_nitirawa@...cinc.com>
To: mani@...nel.org, agross@...nel.org, andersson@...nel.org,
konrad.dybcio@...aro.org, jejb@...ux.ibm.com,
martin.petersen@...cle.com
Cc: quic_cang@...cinc.com, quic_nguyenb@...cinc.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org,
Nitin Rawat <quic_nitirawa@...cinc.com>,
Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Subject: [PATCH V5 3/6] scsi: ufs: qcom: Add multiple frequency support for unipro clk attributes
Add Support to configure CORE_CLK_1US_CYCLES, PA_VS_CORE_CLK_40NS_CYCLES
for multiple unipro clock frequencies. Currently this is handled only for
only 150Mhz and 75MHz.
Co-developed-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Signed-off-by: Naveen Kumar Goud Arepalli <quic_narepall@...cinc.com>
Signed-off-by: Nitin Rawat <quic_nitirawa@...cinc.com>
---
drivers/ufs/host/ufs-qcom.c | 88 ++++++++++++++++++++++++++++++++-----
drivers/ufs/host/ufs-qcom.h | 9 ++++
2 files changed, 87 insertions(+), 10 deletions(-)
diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index abc0e7f7d1b0..8162b19191a9 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -671,6 +671,45 @@ static int ufs_qcom_cfg_timers(struct ufs_hba *hba, u32 gear,
return 0;
}
+static int ufs_qcom_cfg_core_clk_ctrl(struct ufs_hba *hba)
+{
+ struct list_head *head = &hba->clk_list_head;
+ struct ufs_clk_info *clki;
+ u32 max_freq = 0;
+ int err;
+
+ list_for_each_entry(clki, head, list) {
+ if (!IS_ERR_OR_NULL(clki->clk) &&
+ !strcmp(clki->name, "core_clk_unipro")) {
+ max_freq = clki->max_freq;
+ break;
+ }
+ }
+
+ switch (max_freq) {
+ case MHZ_403:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 403, 16);
+ break;
+ case MHZ_300:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 300, 12);
+ break;
+ case MHZ_201_5:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 202, 8);
+ break;
+ case MHZ_150:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 150, 6);
+ break;
+ case MHZ_100:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 100, 4);
+ break;
+ default:
+ dev_err(hba->dev, "unipro max_freq=%u entry missing\n", max_freq);
+ err = -EINVAL;
+ break;
+ }
+
+ return err;
+}
static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
enum ufs_notify_change_status status)
{
@@ -686,12 +725,15 @@ static int ufs_qcom_link_startup_notify(struct ufs_hba *hba,
return -EINVAL;
}
- if (ufs_qcom_cap_qunipro(host))
- /*
- * set unipro core clock cycles to 150 & clear clock
- * divider
- */
- err = ufs_qcom_set_core_clk_ctrl(hba, 150, 6);
+ if (ufs_qcom_cap_qunipro(host)) {
+ err = ufs_qcom_cfg_core_clk_ctrl(hba);
+ if (err) {
+ dev_err(hba->dev,
+ "%s cfg core clk ctrl failed\n",
+ __func__);
+ return err;
+ }
+ }
/*
* Some UFS devices (and may be host) have issues if LCC is
@@ -1369,8 +1411,7 @@ static int ufs_qcom_clk_scale_up_post_change(struct ufs_hba *hba)
if (!ufs_qcom_cap_qunipro(host))
return 0;
- /* set unipro core clock cycles to 150 and clear clock divider */
- return ufs_qcom_set_core_clk_ctrl(hba, 150, 6);
+ return ufs_qcom_cfg_core_clk_ctrl(hba);
}
static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
@@ -1401,12 +1442,39 @@ static int ufs_qcom_clk_scale_down_pre_change(struct ufs_hba *hba)
static int ufs_qcom_clk_scale_down_post_change(struct ufs_hba *hba)
{
struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+ struct list_head *head = &hba->clk_list_head;
+ struct ufs_clk_info *clki;
+ u32 curr_freq = 0;
+ int err;
if (!ufs_qcom_cap_qunipro(host))
return 0;
- /* set unipro core clock cycles to 75 and clear clock divider */
- return ufs_qcom_set_core_clk_ctrl(hba, 75, 3);
+
+ list_for_each_entry(clki, head, list) {
+ if (!IS_ERR_OR_NULL(clki->clk) &&
+ !strcmp(clki->name, "core_clk_unipro")) {
+ curr_freq = clk_get_rate(clki->clk);
+ break;
+ }
+ }
+ switch (curr_freq) {
+ case MHZ_37_5:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 38, 2);
+ break;
+ case MHZ_75:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 75, 3);
+ break;
+ case MHZ_100:
+ err = ufs_qcom_set_core_clk_ctrl(hba, 100, 4);
+ break;
+ default:
+ err = -EINVAL;
+ dev_err(hba->dev, "unipro curr_freq=%u entry missing\n", curr_freq);
+ break;
+ }
+
+ return err;
}
static int ufs_qcom_clk_scale_notify(struct ufs_hba *hba,
diff --git a/drivers/ufs/host/ufs-qcom.h b/drivers/ufs/host/ufs-qcom.h
index 325f08aca260..56550fd36c4e 100644
--- a/drivers/ufs/host/ufs-qcom.h
+++ b/drivers/ufs/host/ufs-qcom.h
@@ -79,6 +79,15 @@ enum {
UFS_MEM_CQIS_VS = 0x8,
};
+/* QCOM UFS host controller core clk frequencies */
+#define MHZ_37_5 37500000
+#define MHZ_50 50000000
+#define MHZ_75 75000000
+#define MHZ_100 100000000
+#define MHZ_150 150000000
+#define MHZ_300 300000000
+#define MHZ_201_5 201500000
+#define MHZ_403 403000000
#define UFS_CNTLR_2_x_x_VEN_REGS_OFFSET(x) (0x000 + x)
#define UFS_CNTLR_3_x_x_VEN_REGS_OFFSET(x) (0x400 + x)
--
2.17.1
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